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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08b7294ebdfa104293c29df3c3f62f2f609211ad31909c01bf038157e134cfb4' 
  AND token = '2qJdGRW5//5DaZ8GP/ek0V7Z2kvapv6V6czxJbX7JAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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