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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e6fb30dc670b806880b95c4ec39559de32a762012971ffce06778d9f750c6e' 
  AND token = '3eHtlTclTfzY2aC+qZ7XW/MzYWSNauCOXaWFkS2MPpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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