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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760f8467ca4f4b7ef0644234a295989531748319e7b6817e28f6f575e90412aa' 
  AND token = 'NCOrh4J/C4mXamCDXRe7+4uZnHs5FRepbujnCv+uRJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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