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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b052a707dd04bc7c7fae1b73c86327407902cf0cb1138ef1236f2c0f7cd52508' 
  AND token = 'r9ivkcWgYSqK+7lSJTIcFqPJxI0bigL9hi58wGQ+g6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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