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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76314244f34ccc7d1590e1afbeabe9cd1b1355abe51ebab95719ffd85ec7ec1b' 
  AND token = 'HrZp6pzsNKT1+DZ8z9YmQ0LNFU1OTIlcjcT/oCqIisI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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