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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be26445fa2774e679cebf2e5e53b619c9f54f558821c5a087e27cc2bb42214f2' 
  AND token = 'cKB4NRXs+W6U1uwIqBLkv25v5m7rjDIjIZ5R5f1BbEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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