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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c55f23fe914eb8a6e8c4b3db3d468ce885b7b04d5e5e37ee02bff78c359401' 
  AND token = 'X5Q/LIjHYF/HALsWO95NRVD/qluslrd9i2mLuWAv+KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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