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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e789be6bf66328e3e0099dbce36261a22a87ecdd0088320f6e34155a052783c2' 
  AND token = '13lb/eJsvyY/7ZIl97Al4o6qtG1ZUTASVpbfSjKAldE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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