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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f448ef2a95b6276e74c15d86866151f8b18eddbe69e9f711ec964e61c9638cc' 
  AND token = 'QuExgNQu4HP14Z/t9wYxm4tKr1kIeAknHICl2jcKz1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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