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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6fe1ab679dc3a5e4e397355425af2bebdf4ff3394ec319172ae5bf517fa5e9b' 
  AND token = 'Vxo4snnHhrvEzShZYZvO21SBCFN90olMRKtDW4ubvPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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