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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b491799d0e6414f8e85a800208a6582f85f8394fbf23505a8f8b45d7a43fda7c' 
  AND token = '5Gzm8M9sQipT727FAyD1i3l+KAOVXfsNOUD+7If8Zbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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