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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8b055b65abf10f83daf768905cd39ae36e7cc31c090ee8ca044583327a92ae' 
  AND token = 'Qu9nVL9IoNdEX6yx43LfR/FvmjjaDoyDnrzLmD+92Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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