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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dea71f44ed71d7629b18d6324e0ddb6162c22ddfe73a33d3731f1dafbc19348' 
  AND token = 'Mir+HGPK1QeGS0tdqcsKS4ETadaegXz+Y/mGiGOMH70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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