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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7633e98e0dc4b364147231f7cb3775b11e36cb84f0b1042725e5bb89b598db9f' 
  AND token = '1+02sH37gtujt6ptWbYP/e8IdWPD3I1r2tWpQABw/Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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