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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb5f7d12e8dac744d7e45ee19b9fb35096d98045d4ed4e83473fc962000dcd5' 
  AND token = 'TyTD1UFXYi80ZeiKk812ybKyhUNl8O2zUGM0tLCwv+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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