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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b988eb7806decbe93f312a4df655ade8a2140cb59a110fd81141370b025d93c9' 
  AND token = 'azwFZEORJmrfQdFAUlSM1qnB2zkoK/ol4PH5hl43QbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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