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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b659c4f58d93157efd1247078fa7ec746ba1a3681214b240ea20e520e0bbcc55' 
  AND token = 'OEqLURbW8EToh9IucD4qX9dPlAVSoR78Uim4KhOeaa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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