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SELECT 
  1 
FROM 
  csscart_lock_keys 
WHERE 
  key_id = 'b0eb512909ac5fa2d12cca048fa3f9ba859eac4a12b7de52bd7e66300cb1535b' 
  AND token = 'N589f0wOeMuLHrjIxElu2aNlMun9py+wKyTwPJp8bhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}