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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af671e8bb9b5320c9091d4b4fc20059caf3dbcc9bf89c1d685112cea4d60282' 
  AND token = 'XKea18PQt574BY3fJM2egYE6il7gA9PNyMKyx8XQT5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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