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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e387e59797c819ba32ff60b7e9dd9a576e3c9277675a2bcaf293ea9e68a23aeb' 
  AND token = 'Zluty2pkzwk8faIN7vS/FHAP4athRsDlKtdpUH1Ne1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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