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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '198298c2e2736129a50e0921f39d1feae3c72bcbddc45154e5e8035a368b9b23' 
  AND token = 'DOAbggEx2O38NcsoDUNYk8LIHng9I7AZs3KHWqlvU4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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