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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '758c0e4afec9f6a923f9aa2c9f053d34a214e7b7ed08e1bbd62dcbff69d2344f' 
  AND token = 'Io68pVYRPdDxU70sYbFN9/rWVpCJC16o92P8rGCV0sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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