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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86df7da8ee3aa2a080000085f008a1c6ed6c3fbc83349f7d2b0def2f894442b8' 
  AND token = 'ppZSNWSJdU90bdvLwjpnomXQLWi5qV3+t7ei48cHTPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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