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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c5af20057e56acfb8b936b8f72cb77c906fcf4676f65137b8421271b8ef183a' 
  AND token = 'R44gTatMYzK9Vay4lXnUyfunCLq0JyhI1SzdC0HuduQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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