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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb1463c0894a7b1b051c89caf4634fdda4e336fc9e37821366adf1e62b3d9146' 
  AND token = 'gbkmzj2U+6+dNf0TAr6rtZvIBYElScSxR8kdYD+9B4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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