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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89af18cd22ae7441c3b9b6876826f7ca52f8c51a4a8d5726ffa86f7dd0038b0f' 
  AND token = 'ihK1T14U0PkdQyTv++lG42jCXFTifaha/uxW52o6lfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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