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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88941d44b55700cd8bcd42e453c33ea8fab57c0026048616bdc55155f52d2132' 
  AND token = 'PAT4pLNq/2NpJW5jD4WoOn0TklV+Qwa4/oG378gN5dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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