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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2626598e8325c6eb8f1c816a121658861546b005303e0da0de4c5d10fd54bcac' 
  AND token = 'hSEQDF9RnyaK2zSqJu7/fbsUZ2099rqMoG7D3QKW0kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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