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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6661e8acdf365fdf38ac6db4d7bded06f984287a63eb27df6e0f638cc62cbc8' 
  AND token = '9JeJEHOcN3ZvzTBDaBycA6S2+ahTy1igNf8wl5OMZIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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