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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b8a037f24a81e72a8f3d85063415c574b6afea89de9ecf3ac1ce7c053e8a70' 
  AND token = 'FElnX2A4LEh2LgGJpKnhvuYGcTu7pXbz5C0PyWbTazY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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