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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9d5a275703dce913542527ad2f8b070acbbe89d7832a499a985f280afb7d26' 
  AND token = '+J5isWpxXrL3PS0rEzOYF0+dWR5ErdsLSqFF1IawH6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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