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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2a5f74d50808e060f8254ec49917042d9b1092ee1cf70fde8b32986351eae2' 
  AND token = 'X9+x3k1cXaBzwTsNn96TmSHsRjphIofxph7DV9tIWRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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