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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0ec6b3219505ac1a0d737b89cbab91575692ef76652451fc57fe0f6bd8c4de6' 
  AND token = '0N6M4ZvSN8gglbKsu/6/I8pn1KScZIo/+lBY7kQHJ2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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