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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6decde07d28c3d8d6b8516628ea322c64eea74bca3f9a9bb5072ae35c0b6c565' 
  AND token = 'zeHFScSfZetIdEUQgNHCeK8JVDLg6FWldlxsH9ZdTOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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