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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7a7a98f92457cd322bd1ae4be9a54076c3b0c642ad5b11fc8f64f98678b269' 
  AND token = 'NNavdEzVQktx8NgEPApCmnDoL/vvC4//0wz8wSeHQCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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