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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6227a9b1f728ee00f3d6ae8e075a81107303e028341e03c712c5c77c5ef0b9c' 
  AND token = 'V8zsjhgo/0pMJesoFTE1hBObAHDk44smjK8Ofb02kVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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