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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88e7333a82feba0dbed24c2f3325ae2e098f9e7a88d2f10a2ec57226c839ad97' 
  AND token = 'w/vOuhxyyzjWzPMSshx2DnTd352MHW+diiGUCL+4aIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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