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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '873e8468d59b7db1176e2078fbb539cdde8c25d2e8eeb5c07465826ac042bc8d' 
  AND token = 'rgWUeU9No4laSVuH4xdC+pjmZTlgGioMu2CMl4FYIT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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