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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0cd157416ba98c8df1e3b6140a18da7d536dacc9b51a6595475c7f147eb42c' 
  AND token = 'EX1NRgUPnx/Fw1FLt386Rexbp4a4g2TumqdzVsR51rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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