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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac8f67cf9ffc828b0996fe5c0e5ce798d691d81616cacdb18a8de60e095d513' 
  AND token = 'CGw9ZyT94FwiErL5ll2MQspIGgifQg/2+JtwXTtP+fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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