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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ec669a77d4df4b1f15d9909a982fc7d2fcf90dfd5a1733e609ba5e0ee9bc19' 
  AND token = 'oM8ACRTIyCCtOsCEGyQ/k4uXEaGEkDu67y3AgOH3dyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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