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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f3062d68b6c404a83b7ac672d39a6decb5b74c69f438c6d756d6dfdcbba51f' 
  AND token = 'FlXOZdh52K97MgJuOQFRv95I4kJkE9Nodc9+Sia2uB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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