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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2432ad7fc839091bbcc2ac972a282974d64336537aee1c1a128af4f5fca86409' 
  AND token = 'AMwZPuV10SkFDMwOlqJib6qP9QDXZa/fQ9/iW8J8cHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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