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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8531c37fcc9166f52c86c5827a44c1b9a46c0fbb12797c54d5be46562092278' 
  AND token = 'DkvhtU5A4ZFN3GtQ9bfdInCe9F+6JyfSn1MsvzMyBfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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