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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391b259e1ca3ff31de076b16d73ba292f4ca43e77dc77cd57d4a607f8b960358' 
  AND token = 'pdcQ7WWdH6wDRnzeAA48V9z8vsyDor7jrg2kE6R03H8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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