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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a30bd5c855c862a306dd08e9faa28bc948ba8f6247e7d4f611fb76d7a5ff852' 
  AND token = 'lHr7bfnQQ90VfoeGUvhSiIfOHJoESLJUaOezuyEt/+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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