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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c0af1f79114a29f41a1043cb09e04ad0d8a3b67ed026c8bad40eb902b3a8fc8' 
  AND token = 'lF3tKJhJAHdz0PqRcE91NzFzbvG3I8fDAJ+MAiiy0+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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