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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68aaa4b3b519eeab252c7e41d00e326e6b48cb62198ee2d527649c4f03d4ed06' 
  AND token = '/Nh5I/VD07t9B4qXA5mNh86A3w8r+ik89xa1CCw39hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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