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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926e41268a5e8e14672ccde445bdc4e6061edcd0d9397d417b93fd32f74d9863' 
  AND token = '3BuhIqo9O61sMPgnV3gLDt9WFkNqPEAL8fS9rfM900c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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