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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262ccaa9eb5883d9e2e4b19b6c67018059d70dbbcfae71d99ceab864b9441331' 
  AND token = '7i3LRHx7E6JYHB293RUfP5gLEzR6JvZImphRRZAaMgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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