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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '926d4b8b8bb020161414d21f967f9039f2fd2b6f4116cf70a863d07ed810fd48' 
  AND token = 'UzhVs907UpuK06XZLNRsBoVOnpIyj1xozYkEP+PHsfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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