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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91fe8dd015e375ea040c35aedbadbe3e53c6f44ac755ebb4f7b3cdef7adcc3d8' 
  AND token = 'PeP9liSCx/YQktJXzr3KRys76qYm3Rls8XzlZe+sf9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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