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SELECT 
  1 
FROM 
  csscart_lock_keys 
WHERE 
  key_id = '4b62a12ec2794660f94a74ba40d2b209024e4118e3bf455aad19acbd7614b11d' 
  AND token = 'FYudyft1StTT8H4NPKfnL43FkyjJGF7khzjNGVr0Jlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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