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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '678d8f637ffb5a7b7317fc74e70a39790d4d3f11239faef384031409a1ee15a7' 
  AND token = 'k/j8xLpBR+qVn7see2aFte+7nEycE6i4ZIJqJuSzYrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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