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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f01bedb3a3f68d25294ddb77cfd30fab40fc1d881e6ac1a051271884a69771' 
  AND token = 'hycKfDQ9F7Y9T/HwganRcduUnkbqA2LMxhVuERWneRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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