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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b8a3abdaabd70e2a8e13ea560ae83c869f4d2dd82ffb09875f12931b92c32a' 
  AND token = 'eoGxp5bkDBhdV+fyEYDq2utYeD40Y1kecx9uz0CGg0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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