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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '716bc9d1098f4277bc3a0b07dca2d0bb73037a801cf32c7b45f2dd401ba5f8cc' 
  AND token = '0JNsHLC3mVm6VLFTE2KCR+5OnBNSEXIykWxxqZgll9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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