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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f4912b4beab2e07af8a30dd5055d1afe73d2df5bd5516a80b563a99fa0a865' 
  AND token = 'aWb2ZnzwrrFN/bB9F9J8mFSmLdnlWjBuV0x4uD4NyDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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