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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17a95b0269a7ad759ef5c09379814e4716897ed4586bb0acdbd6de0c2d5f0fe9' 
  AND token = 'sCbgMiRi6G2oG2xaFQbS6VWR3YytXBP6rmh9P9sHImA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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