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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc0f54a963a3edfd9bf0776f7b7725ffcd0b16c4f4773983b25e7437a891934' 
  AND token = 'gskXXaU6vANUf3RyDdizvZpP1l0yfpRK1kYlRtuoHog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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